Somvati Amavasya, or Amavasi is the new moon day or the no moon day that falls on a Monday (Somvar). Next Somvati Amavasya is on May 18, 2015. From sunrise to 9:29 AM on May 18. The significance of Somvati Amavasya was explained by Bhisma to Yudhishtra in the Mahabharata. It is said that who ever takes a dip in the important rivers on the day would be prosperous, free of diseases and would be free from grief and sorrow.

It is also believed that by taking a dip in the holy rivers the soul of ancestors will rest in peace.

Married women take the holy dip for a happy family life and for the long life of husbands. They also worship the pipal tree.

Somavara Amavasya Vrata (fasting) is observed for a long and happy married life.

Many devout Hindus also fast on the day and some people only have a single meal.

On the day thousands of people take a dip in Ganga at Haridwar, Triveni and other places.